crypto: omap - add base support library for common routines
This contains the generic APIs for aligning SG buffers. Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tero Kristo
Herbert Xu
parent
418f2a8cf2
commit
74ed87e7e7
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@ -314,6 +314,15 @@ config HW_RANDOM_PPC4XX
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This option provides the kernel-side support for the TRNG hardware
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found in the security function of some PowerPC 4xx SoCs.
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config CRYPTO_DEV_OMAP
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tristate "Support for OMAP crypto HW accelerators"
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depends on ARCH_OMAP2PLUS
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help
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OMAP processors have various crypto HW accelerators. Select this if
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you want to use the OMAP modules for any of the crypto algorithms.
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if CRYPTO_DEV_OMAP
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config CRYPTO_DEV_OMAP_SHAM
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tristate "Support for OMAP MD5/SHA1/SHA2 hw accelerator"
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depends on ARCH_OMAP2PLUS
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@ -351,6 +360,8 @@ config CRYPTO_DEV_OMAP_DES
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the ECB and CBC modes of operation are supported by the driver. Also
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accesses made on unaligned boundaries are supported.
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endif # CRYPTO_DEV_OMAP
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config CRYPTO_DEV_PICOXCELL
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tristate "Support for picoXcell IPSEC and Layer2 crypto engines"
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depends on (ARCH_PICOXCELL || COMPILE_TEST) && HAVE_CLK
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@ -20,6 +20,7 @@ obj-$(CONFIG_CRYPTO_DEV_MXC_SCC) += mxc-scc.o
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obj-$(CONFIG_CRYPTO_DEV_NIAGARA2) += n2_crypto.o
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n2_crypto-y := n2_core.o n2_asm.o
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obj-$(CONFIG_CRYPTO_DEV_NX) += nx/
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obj-$(CONFIG_CRYPTO_DEV_OMAP) += omap-crypto.o
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obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes.o
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obj-$(CONFIG_CRYPTO_DEV_OMAP_DES) += omap-des.o
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obj-$(CONFIG_CRYPTO_DEV_OMAP_SHAM) += omap-sham.o
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@ -0,0 +1,184 @@
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/*
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* OMAP Crypto driver common support routines.
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*
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* Copyright (c) 2017 Texas Instruments Incorporated
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* Tero Kristo <t-kristo@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/scatterlist.h>
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#include <crypto/scatterwalk.h>
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#include "omap-crypto.h"
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static int omap_crypto_copy_sg_lists(int total, int bs,
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struct scatterlist **sg,
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struct scatterlist *new_sg, u16 flags)
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{
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int n = sg_nents(*sg);
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struct scatterlist *tmp;
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if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) {
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new_sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
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if (!new_sg)
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return -ENOMEM;
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sg_init_table(new_sg, n);
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}
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tmp = new_sg;
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while (*sg && total) {
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int len = (*sg)->length;
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if (total < len)
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len = total;
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if (len > 0) {
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total -= len;
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sg_set_page(tmp, sg_page(*sg), len, (*sg)->offset);
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if (total <= 0)
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sg_mark_end(tmp);
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tmp = sg_next(tmp);
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}
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*sg = sg_next(*sg);
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}
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*sg = new_sg;
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return 0;
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}
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static int omap_crypto_copy_sgs(int total, int bs, struct scatterlist **sg,
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struct scatterlist *new_sg, u16 flags)
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{
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void *buf;
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int pages;
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int new_len;
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new_len = ALIGN(total, bs);
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pages = get_order(new_len);
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buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
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if (!buf) {
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pr_err("%s: Couldn't allocate pages for unaligned cases.\n",
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__func__);
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return -ENOMEM;
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}
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if (flags & OMAP_CRYPTO_COPY_DATA) {
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scatterwalk_map_and_copy(buf, *sg, 0, total, 0);
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if (flags & OMAP_CRYPTO_ZERO_BUF)
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memset(buf + total, 0, new_len - total);
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}
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if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY))
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sg_init_table(new_sg, 1);
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sg_set_buf(new_sg, buf, new_len);
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*sg = new_sg;
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return 0;
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}
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static int omap_crypto_check_sg(struct scatterlist *sg, int total, int bs,
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u16 flags)
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{
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int len = 0;
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int num_sg = 0;
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if (!IS_ALIGNED(total, bs))
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return OMAP_CRYPTO_NOT_ALIGNED;
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while (sg) {
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num_sg++;
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if (!IS_ALIGNED(sg->offset, 4))
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return OMAP_CRYPTO_NOT_ALIGNED;
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if (!IS_ALIGNED(sg->length, bs))
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return OMAP_CRYPTO_NOT_ALIGNED;
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len += sg->length;
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sg = sg_next(sg);
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if (len >= total)
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break;
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}
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if ((flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) && num_sg > 1)
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return OMAP_CRYPTO_NOT_ALIGNED;
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if (len != total)
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return OMAP_CRYPTO_BAD_DATA_LENGTH;
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return 0;
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}
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int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs,
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struct scatterlist *new_sg, u16 flags,
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u8 flags_shift, unsigned long *dd_flags)
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{
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int ret;
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*dd_flags &= ~(OMAP_CRYPTO_COPY_MASK << flags_shift);
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if (flags & OMAP_CRYPTO_FORCE_COPY)
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ret = OMAP_CRYPTO_NOT_ALIGNED;
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else
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ret = omap_crypto_check_sg(*sg, total, bs, flags);
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if (ret == OMAP_CRYPTO_NOT_ALIGNED) {
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ret = omap_crypto_copy_sgs(total, bs, sg, new_sg, flags);
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if (ret)
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return ret;
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*dd_flags |= OMAP_CRYPTO_DATA_COPIED << flags_shift;
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} else if (ret == OMAP_CRYPTO_BAD_DATA_LENGTH) {
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ret = omap_crypto_copy_sg_lists(total, bs, sg, new_sg, flags);
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if (ret)
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return ret;
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if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY))
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*dd_flags |= OMAP_CRYPTO_SG_COPIED << flags_shift;
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} else if (flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) {
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sg_set_buf(new_sg, sg_virt(*sg), (*sg)->length);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(omap_crypto_align_sg);
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void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,
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int offset, int len, u8 flags_shift,
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unsigned long flags)
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{
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void *buf;
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int pages;
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flags >>= flags_shift;
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flags &= OMAP_CRYPTO_COPY_MASK;
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if (!flags)
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return;
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buf = sg_virt(sg);
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pages = get_order(len);
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if (orig && (flags & OMAP_CRYPTO_COPY_MASK))
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scatterwalk_map_and_copy(buf, orig, offset, len, 1);
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if (flags & OMAP_CRYPTO_DATA_COPIED)
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free_pages((unsigned long)buf, pages);
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else if (flags & OMAP_CRYPTO_SG_COPIED)
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kfree(sg);
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}
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EXPORT_SYMBOL_GPL(omap_crypto_cleanup);
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MODULE_DESCRIPTION("OMAP crypto support library.");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>");
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@ -0,0 +1,37 @@
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/*
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* OMAP Crypto driver common support routines.
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*
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* Copyright (c) 2017 Texas Instruments Incorporated
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* Tero Kristo <t-kristo@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#ifndef __CRYPTO_OMAP_CRYPTO_H
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#define __CRYPTO_OMAP_CRYPTO_H
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enum {
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OMAP_CRYPTO_NOT_ALIGNED = 1,
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OMAP_CRYPTO_BAD_DATA_LENGTH,
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};
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#define OMAP_CRYPTO_DATA_COPIED BIT(0)
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#define OMAP_CRYPTO_SG_COPIED BIT(1)
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#define OMAP_CRYPTO_COPY_MASK 0x3
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#define OMAP_CRYPTO_COPY_DATA BIT(0)
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#define OMAP_CRYPTO_FORCE_COPY BIT(1)
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#define OMAP_CRYPTO_ZERO_BUF BIT(2)
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#define OMAP_CRYPTO_FORCE_SINGLE_ENTRY BIT(3)
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int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs,
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struct scatterlist *new_sg, u16 flags,
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u8 flags_shift, unsigned long *dd_flags);
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void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,
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int offset, int len, u8 flags_shift,
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unsigned long flags);
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#endif
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